2016 County Engineer s Workshop

Transcription

1 2016 County Engineer s Workshop Manistee, Michigan Presented By: Tim Moomaw, WSDOT Construction Trainer February 2, 2016

2 Presentation Overview This presentation will review the past, present and future use of Chip Seals in Washington State. In 2014, WSDOT received SHRP 2 Implementation funds to assess the use of Chip Seals for high traffic volume routes. Review of this project for Q & A.

3 Negative Perceptions Chip Seals can t / shouldn t be done Too high of traffic levels Won t improve the road Breaks windshields Not for bicycles

4 2000 Preservation Projects Lane Miles

5 Presentation Overview WSDOT Pavement Preservation Strategies WA State Senate requests information on business practices in 2010.

6 Communication Plan Commitment to Transparency Quarterly Performance Report March 2015 Edition

7 Communication Plan City of Shoreline, WA Promo Video //

8 Connecting Washington Transportation Package $16 billion package 11.9-cent gas tax increase (62 /Gal) $1.4 billion for preservation (16 yrs)

9 Geographic Challenges Dry & Arid Eastern Washington Mild Coastal Region Mountain Passes

10 Optimal Timing Dependent on the existing pavement structure, each pavement condition will have a corresponding corrective action.

11 Chip Seal Best Practices Chip Seal Best Practices NCHRP Synthesis 342 Highlighted QA/QC Measures 40 best practices identified Racked-in-Seal described

12 Chip Seals Systems Systems Selection Type of binder Gradation of aggregate Number of courses Types of courses Type of existing surface

13 Chip Seal Systems System Selection Cationic Rapid Set Single Size & Uniform Asphalt Cement. Single Size, Dry & Pre-Coated High Float. Dense graded, Crushed Cover Stone Cutbacks Dense graded, Crushed Cover Stone

14 Past Use of Chip Seals Bituminous Macadam Construction Gravel Road Conversion New Construction Cushion Course

15 Past Use of Chip Seals Seal Coats Capital Projects Maintenance Major change from current philosophy.

16 Past use of Chip Seals Compatible Materials Asphalt Emulsion Aggregate

17 Past Chip Seal Practice Chip Seal System Selection Many failures occurred with the various chip seal systems used. This attributed to poor public opinion.

18 Past Use of Chip Seals Collaboration with Industry Beginning in 2006, meetings were held which included: WSDOT, Contractors, Suppliers and other Local Agencies.

19 Chip Seal Construction Specification Changes Standardization of Aggregate Size Inclusion of Choke Stone Use of Steel Wheel Rollers Measure and Pay for Aggregates by S.Y. Maximum Surface Temperature of 130 F

20 Current Preservation Policy Bituminous Surface Treatments (BST s) WSDOT has began using an integrated approach to our preservation treatments. Crack Seal Chip Seal Fog Seal

21 Chip Seal Design Chip Seal System Selection Rural Urban Snow Zones Traffic Volumes

22 Current Chip Seal Practices CRS2-P, Cationic Rapid Set w/ Polymer Racked-in-Seal 3/8 - #4 course aggregate Coverstone 0 - #4 Choke Stone Fog Seal 3-5 days after placement High Traffic Levels (up to 30,000 ADT)

23 Current Chip Seal Practices High Float Emulsion, HFE-150 Lower Cost Slow cure time High fugitive dust Low volume routes

24 Current Chip Seal Practices AC15-P, Asphalt Cement w/polymers High traffic volume Low fugitive dust Quick set time Striping same day

25 Current Chip Seal Practices Mountain Passes Mountain Passes are challenging for a chip seal to be successful.

26 Current Chip Seal Practices Mountain Passes Mobilization of crews and equipment can be challenging and a costly venture.

27 Current Chip Seal Practices Mountain Passes Snow Plow Damage A larger aggregate structure will produce a more tenacious wearing course to mitigate these obstacles.

28 Current Chip Seal Practices Mountain Passes For routes with steep grades and super elevated curves, WSDOT has incorporated 24 hour piloted traffic.

29 Current Chip Seal Practices Mountain Passes CRS2-P, Cationic Rapid Set 1/2 1/4 Coverstone Choke Stone Fog Seal

30 Current Chip Seal Practices Major Arterial Intersections HMA Overlay Choke Stone Cape Seal

31 Future Chip Seal Practices Cape Seal Intersections Bike Routes 2015 Trial project SR 207

32 Future Use of Chip Seals Hot-Applied Chip Seal Systems Asphalt Cement AC-15P CRM blend

33 Future Use of Chip Seals 2014 Trial Project State Route 97A, in the central part of Washington State was chosen to construct WSDOT s first Asphalt Cement chip seal.

34 Future Use of Chip Seals AC-15P HBST Chip Seal System 3/8 - #8 Aggregate Pre-Coat Aggregate PG Stockpile (Dry) Apply (Cold)

35 Future Use of Chip Seals Mountain Passes AC-15P HBST 3/8 #4 Coverstone Choke Stone Fog Seal

36 Future Use of Chip Seals CRM HBST Chip Seal System 3/8 - #4 Aggregate Pre-Coat Aggregate PG Apply (Hot)

37 Future Use of Chip Seals CRM HBST Chip Seal System In 2015, Chelan County employed the use of Crumb Rubber Modified (CRM) chip seal.

38 Future Use of Chip Seals Options (Prices may vary depending on factors applied) CRS-2P BST Chip Seal $1.50/SY AC15-P HBST Chip Seal $2.00/SY CRM HBST Chip Seal $4.00/SY HMA Thin Lift Overlay $10.00/SY

39 Future Use of Chip Seals Racked-in-Seal..To Choke or not to Choke Asphalt Emulsion Chip Seals Asphalt Cement Chip Seals

40 Future Use of Chip Seals Fog Seal. newly constructed Chip Seal Asphalt Emulsion Chip Seals Asphalt Cement Chip Seals

41 Summary Using the Right Tool Asphalt Emulsion BST CRS-2P Asphalt Emulsion BST HF-150 Asphalt Cement HBST AC-15P

42 Tim Moomaw